Remove React/Ink dependencies and add context window management

- Remove unused React and Ink CLI dependencies to simplify package
- Update provider schema to use maxOutputTokens for clarity
- Add automatic summarization when approaching context window limits
- Simplify message event handling and add cost/token metadata display

🤖 Generated with opencode
Co-Authored-By: opencode <noreply@opencode.ai>

js/src/provider/provider.ts

@@ -11,7 +11,7 @@ export namespace Provider {
         outputCached: z.number(),
       }),
       contextWindow: z.number(),
-      maxTokens: z.number().optional(),
+      maxOutputTokens: z.number().optional(),
       attachment: z.boolean(),
       reasoning: z.boolean().optional(),
     })